tell him one of the joints on the boiler blew off, which accounts for the wet floor, and it's been repaired. sure as hell he'll take a damp reading, but try to dry it out obviously. when we sold ours, the washing machine dropped its entire content of water over the floor which then soaked into the concrete slab under the laminate floor. scrapped the flooring, spent two nights drying the slab with a hot air gun, and ran a dehumidifier 24/7.
1st thing the surveyor asked was "did the washing machine leak?" Luckily, we had bought a brand new one, and she seemed satisfied with that.